Extract the debounce/dedup/transition scaffold that StateDeputyFilters,
TerritoryFilters and MunicipalityFilters each reimplemented into
useCampaignListFilterNavigation, and unify the two behaviors that had
silently diverged: touching a filter mid-typing used to discard the
pending search on dobradinhas and territorios, and the debounce timer
captured a stale state, so a sort clicked within its window was reverted
a second later. Also folds the six copies of the pending-transition
fallback into useCampaignListTransition and drops a redundant aria-live
that made the municipality summary the third live region on its page.
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